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"curve fitting" is correct and usable in written English.
It can be used to refer to the process of finding the best curve to match a set of data points. For example: "We used curve fitting to generate the graph for our experiment."
Exact(59)
This may require a curve fitting algorithm or a traditional 'flexicurve' (curve fitting ruler) on paper.
The fitting was performed using Matlab curve fitting tools.
This curve fitting was performed using the nonlinear least square fitting functions in the MATLAB Curve Fitting Toolbox (The Mathworks, Natick, MA, USA).
Step 5. Curve Fitting.
Figure 12 NMF curve fitting.
The resulting responses are curve fitted using polynomial curve fitting.
R2∗ was obtained by multi-line spectral curve fitting.
The results of curve fitting are shown in Table 6.
The smaller the RMSE value, the better the curve fitting.
A curve fitting scheme is employed to find model parameters.
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The analysis was performed using five-parametric-curve fitting.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com